Stalk Spanish hero on the rise after exercises (7)

'stalk' is the definition.
(stalk-like part of an organ)

'spanish hero on the rise after exercises' is the wordplay.
'spanish hero' becomes 'elcid' (El Cid, name for warlord Rodrigo Daz de Vivar).
'on the rise' is a reversal indicator.
'after' says to put letters next to each other.
'exercises' becomes 'pe' (Physical Education class).
'elcid' backwards is 'dicle'.
'dicle' after 'pe' is 'PEDICLE'.